Teledyne 3000TA-XLEU - Trace oxygen analyzer - Manual (Page 28)

Operational Theory 3000TA-XL-EU
Teledyne Analytical Instruments 12
If, however, a low range accuracy better than 100 ppb is required,
then a zero calibration is recommended. See Section 4.4.1.
2.3 Sample System
The sample system delivers gases to the Micro-fuel Cell sensor
from the analyzer rear panel inlet. Depending on the mode of operation
either sample or calibration gas is delivered.
The Model 3000TA-XL-EU sample system is designed and
fabricated to ensure that the oxygen concentration of the gas is not
altered as it travels through the sample system.
The sample system for the standard instrument incorporates VCR
tube fittings for sample inlet and 1/4” outlet tube connections at the rear
panel. The sample or calibration gas that flows through the system is
monitored by a flowmeter downstream from the cell. Figure 2-4 shows
the piping layout for the standard model.
Figure 2-5 shows the flow diagram for sampling systems used for
the three configurations offered as options for this instrument. In the
standard instrument, calibration gases can be connected directly to the
Sample In port by teeing to the port with appropriate valves.